- Can constructor take any number of parameters?
- Why do we use constructor?
- Can we declare constructor as public?
- Why return type is not allowed for constructor?
- What is constructor and its types?
- Can a constructor be static?
- When should a constructor be private?
- Can constructor have return type in C++?
- Can a constructor be private?
- Which type of constructor can’t have a return type?
- Can constructor have void return type?
- Can a constructor be void?
- What is the difference between constructors and destructors?
- What is the difference between constructor and function?
- Can we use return in constructor?
Can constructor take any number of parameters?
Typically, the constructor initializes the fields of the object that need initialization.
Java constructors can also take parameters, so fields can be initialized in the object at creation time..
Why do we use constructor?
The purpose of constructor is to initialize the object of a class while the purpose of a method is to perform a task by executing java code. Constructors cannot be abstract, final, static and synchronised while methods can be. Constructors do not have return types while methods do.
Can we declare constructor as public?
No, Constructors can be public , private , protected or default (no access modifier at all). Making something private doesn’t mean nobody can access it. It just means that nobody outside the class can access it. … Using private constructor we can ensure that no more than one object can be created at a time.
Why return type is not allowed for constructor?
So the reason the constructor doesn’t return a value is because it’s not called directly by your code, it’s called by the memory allocation and object initialization code in the runtime. Its return value (if it actually has one when compiled down to machine code) is opaque to the user – therefore, you can’t specify it.
What is constructor and its types?
A constructor is a special type of function with no return type. Name of constructor should be same as the name of the class. We define a method inside the class and constructor is also defined inside a class. A constructor is called automatically when we create an object of a class.
Can a constructor be static?
A static constructor does not take access modifiers or have parameters. A class or struct can only have one static constructor. Static constructors cannot be inherited or overloaded. A static constructor cannot be called directly and is only meant to be called by the common language runtime (CLR).
When should a constructor be private?
Private constructors are used to prevent creating instances of a class when there are no instance fields or methods, such as the Math class, or when a method is called to obtain an instance of a class. If all the methods in the class are static, consider making the complete class static.
Can constructor have return type in C++?
Constructors in C++ Constructors are functions of a class that are executed when new objects of the class are created. The constructors have the same name as the class and no return type, not even void.
Can a constructor be private?
Yes, we can declare a constructor as private. If we declare a constructor as private we are not able to create an object of a class. We can use this private constructor in the Singleton Design Pattern.
Which type of constructor can’t have a return type?
No, constructor does not have any return type in Java. Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. Mostly it is used to instantiate the instance variables of a class.
Can constructor have void return type?
Constructor(s) do not return any type while method(s) have the return type or void if does not return any value. Constructor is called only once at the time of Object creation while method(s) can be called any numbers of time.
Can a constructor be void?
Note that the constructor name must match the class name, and it cannot have a return type (like void ). Also note that the constructor is called when the object is created.
What is the difference between constructors and destructors?
Constructor helps to initialize the object of a class. Whereas destructor is used to destroy the instances.
What is the difference between constructor and function?
1) Function has to be invoked. Constructor automatically gets invoked. 2) Function has return type. Constructor has no return type.
Can we use return in constructor?
No, constructor does not return any value. While declaring a constructor you will not have anything like return type. In general, Constructor is implicitly called at the time of instantiation. And it is not a method, its sole purpose is to initialize the instance variables.